Question about Toyota Corolla

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I have a 4AF Carby engine. I have replaced the plugs, leads, oil+filter, head gasket, waterpump, radiator and given the carby a clean and changed the air filter. I still seem to lose power on take-off (stationary) but cant figure out why? It mainly happens when it is cold, and it was more regular before I cleaned the carby. After I cleaned it, I took it for a test run and ran beaut, until now. I did notice that it is idling a bit higher, and that the hose at the immediate front that runs from the air intake to the top of the exhaust manifold has deteriorated badly. Could this be contributing to the loss of power at acceleration?

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Its very possible that it could if it were a vacuum hose that's cracked or trashed.This could definitely cause the symptoms that your experiencing with your car.

Posted on Mar 21, 2011


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not enough details as to make model year ,engine capacity, carby and any work done like changed plugs and leads , tune up etc
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if you look at the drillings and passage ways of the carby you will notice what appears to be plugs inserted where it has been necessary to use a drill to make a circuit for the fuel and air flow
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have you had the head gasket replaced? you may have a cracked or coroaded head that may need to be repaired first,if you have had it repaired blow out with compressed air and may be spray some carby cleaner down the spark plug holes hope this helps

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HI i have a 1983 toyota hilux 2wd ute the motor is a 2lt petrol,it is running on 3cylinders at a idle if reved up it sort of runs on 3.5 to 4 cylinders. ihave checked the points ,replaced spark...

I doubt that it would be the carby as it services all of the pistons so it will not just work on three. Have you been able to narrow down what cylinder its missing on? Have you pulled the plug leads off one by one with insulated pliers to see which lead does not have any effect on the idling? If you have changed the plugs and replaced the cap, it could be that the leads are breaking down. Have you swapped the leads to another piston and then done the plug pull test again?
The test you have done on the head gasket would indicate a problem if your water and oil are mixing, but have you tested to see if water has broken into your cylinders. A cpmpresion test is cheap and easy to do. If you dont have a test unit, you can warm the engine on 3.5 cylinders and then stp the engine and let it rest. The water pressure will continue to squirt water into the cylinder. Take all of the plugs out when its cool and turn the engine over once or twice. If water shoots out of a plug hole, thats your problem.
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1 Answer

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if none of these some carby's or throttle body's have iddle screww which can be adjusted to speed up iddle , or if throttle body it may have an iddle soleniod which may need to be replaced ,
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hope you need only to adjust carby or check timing is o.k

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